1. After opening the workspace, open the layout in the menu above, as shown in the figure.

2. Then find the background setting bar on the last page and open it.

3. The background setting bar has three module options: no background, solid color and bitmap.

4. After selecting a solid background, open the drop-down color panel on the right, find the solid color you like, and then confirm.

5. This will change the background color.